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RESEARCH PRODUCT
Earth resistance measurements in urban contexts: Problems and possible solutions
Eleonora Riva SanseverinoGaetano ZizzoRiccardo TommasiniMaria Luisa Di SilvestrePietro ColellaEnrico Ponssubject
earthing systemEngineering020209 energyMultiphysicsContext (language use)02 engineering and technologyEarthing; Grounding; earth resistance measurements; urban context; IEEE Std. 81; EN 50522; fall-of-potential method; earthing system; unknown buried metallic partsField (computer science)Operator (computer programming)0202 electrical engineering electronic engineering information engineeringurban contextGroundingSimulationInterconnectionbusiness.industryGroundEN 50522Potential methodEarthing systemReliability engineeringSettore ING-IND/33 - Sistemi Elettrici Per L'Energiafall-of-potential methodunknown buried metallic partsEarthingearth resistance measurementsIEEE Std. 81businessEarth resistancedescription
Both EN 50522 and IEEE Std. 81 propose the Fall of Potential Method (FPM) to carry out the measurement of the resistance to earth of an Earthing System (ES). However, in urban areas, the recommended distances between the ES and auxiliary electrodes are not easy to respect, due to the presence of buildings and tarmac. Moreover, unknown buried metallic parts, as well as the interconnection among the ESs made by the Distributor System Operator, could modify the earth potential profile of the area, affecting the measurement results. In this paper, the issues that could affect the measurement result if FPM is used in an urban context are presented. A parametric analysis, carried out with Comsol Multiphysics, quantifies the errors due to wrong positioning of the auxiliary electrodes with reference to the ES under test. In addition, a field measurement is described, emphasizing the main aspects that could compromise the results. Finally, practical suggestions to reduce errors are provided.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2017-06-01 |